名词
中文翻译：Unknown
同义词：
['sulfuric acid', 'calcium sulfate', 'calcium carbonate']
例句：
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1. The soil was hardened with sulfuric acid to improve its fertility.
用硫酸处理土壤以改善其肥力。
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2. The farmer applied calcium sulfate to the soil to increase its moisture retention.
农民向土壤施用硫酸钙以提高水分保持能力。
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3. The limestone was used as a soil conditioner by adding calcium carbonate.
通过添加碳酸钙，石灰石被用作土壤调节剂。